[LLVMbugs] [Bug 2537] New: -loop-reduce crashes with extremely large stride

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Thu Jul 10 07:58:36 PDT 2008


           Summary: -loop-reduce crashes with extremely large stride
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sharparrow1 at yahoo.com
                CC: llvmbugs at cs.uiuc.edu


target datalayout =
target triple = "i686-pc-linux-gnu"

define void @a() {
        br label %dobody

dobody:         ; preds = %dobody, %entry
        %y.0 = phi i128 [ 0, %entry ], [ %add, %dobody ]
        %x.0 = phi i128 [ 0, %entry ], [ %add2, %dobody ]
        %add = add i128 %y.0, shl (i128 1, i128 64)
        %add2 = add i128 %x.0, shl (i128 1, i128 48)
        call void @b( i128 %add )
        %cmp = icmp ult i128 %add2, shl (i128 1, i128 64)
        br i1 %cmp, label %dobody, label %afterdo

afterdo:                ; preds = %dobody
        ret void

declare void @b(i128)

This blows up in -loop-reduce because it blindly uses getSExtValue() without
checking the size of the value.

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